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Who does the work : PHP or mysql ?

This is just an example, I'm more interested in the more general aspect of mysql operations.
e.g, you have birthdate and you wanna find age.

Ok, since mysql has the capacity to do various math,numerical,string,date operations, I was just wondering, since I dont have a sound knowledge of mysql performance, when it comes to those types of operations which one is faster:

Get the values from mysql and then let deal with it in php coding
or
make more complex SELECT statements to let mysql do the work and then just pull the results from the required column/table.